Telnet automatically every 15 minutes

cgcamal · 11-06-2008, 11:43 PM

Hi experts,

Maybe somebody knows the answer:

Is possible to configurate a telnet session every certain
time(every 15 minutes for example) and after every connection
execute a script?

I dont know how, but something like:

Code:

******************************************
Every 15 minutes

   Telnet XXX.XXX.XXX.XXX
   user: myuser
   pwd:  mypwd

   run script.txt

Disconnet
******************************************

Thanks for any suggestion you could give me.

Best regards

allez · 11-07-2008, 01:46 AM

You may use expect utility in shell script, or Net::Telnet module if you use Perl.

jlinkels · 11-07-2008, 09:01 AM

If you have a fast and reliable connection (that is, both computers are in the same LAN), you could use this:

Code:

cat input_file.txt | netcat your_host 23

The contents of input_file.txt is:

Code:

username
password
command1
command2
command3
exit

Looking at the code after a few years I am surprised that it still works. I used the first line (cat input...) in another script to check if a wireless router had still an RF connection. If not, I would reset it. There is a REQUIREMENT that the host you are telnetting to is there and responding. The script I am talking about which did the checking and contains the line (cat input...) I called with cron every 15 minutes. Standard rule: if intervals are below 2 minutes, use a loop and sleep, over 2 minutes, use crontab.

If your connection is not reliable or the host is not always there, use Expect. Tricky to learn Tcl/Expect, but there are plenty of examples around.

jlinkels

cgcamal · 11-07-2008, 10:49 PM

Thanks allez and jlinkels for your answers,

I´ll try what you´ve said to me.

Best regards

nehaandrew · 11-26-2008, 12:06 PM

There are multiple auto login scripts available on the net. You can configure your .profile file to run a script each time you login.

I believe coupling the above two ideas - you can build the solution you need.

Linux